I'm getting the message
Nov 22 13:06:56 grover dovecot: imap-login: Disconnected (no auth attempts): rip=192.168.2.3, lip=192.168.2.5, TLS: Disconnected
every second on my CentOS-6.4 server. Is this purely an informational message? Or is it an error message? And in either case, how can I stop the flood of messages?